Swift Syntax Dashboard

Efforts are actively under way to migrate most rules off SourceKit to use SwiftSyntax instead.

Rules written using SwiftSyntax tend to be significantly faster and have fewer false positives than rules that use SourceKit to get source structure information.

23 out of 239 (9%) of SwiftLint’s linter rules use SourceKit.

Rules Using SourceKit

Default Rules (6)

• custom_rules: Custom Rules
• file_length: File Length
• line_length: Line Length
• statement_position: Statement Position
• trailing_whitespace: Trailing Whitespace
• vertical_whitespace: Vertical Whitespace

Opt-in Rules (17)

• accessibility_label_for_image: Accessibility Label for Image
• accessibility_trait_for_button: Accessibility Trait for Button
• closure_end_indentation: Closure End Indentation
• expiring_todo: Expiring Todo
• file_header: File Header
• file_types_order: File Types Order
• indentation_width: Indentation Width
• literal_expression_end_indentation: Literal Expression End Indentation
• modifier_order: Modifier Order
• multiline_function_chains: Multiline Function Chains
• multiline_parameters_brackets: Multiline Parameters Brackets
• quick_discouraged_call: Quick Discouraged Call
• sorted_imports: Sorted Imports
• type_contents_order: Type Contents Order
• vertical_whitespace_between_cases: Vertical Whitespace Between Cases
• vertical_whitespace_closing_braces: Vertical Whitespace before Closing Braces
• vertical_whitespace_opening_braces: Vertical Whitespace after Opening Braces

Rules not Using SourceKit

Default Rules (93)

• attribute_name_spacing: Attribute Name Spacing
• blanket_disable_command: Blanket Disable Command
• block_based_kvo: Block Based KVO
• class_delegate_protocol: Class Delegate Protocol
• closing_brace: Closing Brace Spacing
• closure_parameter_position: Closure Parameter Position
• colon: Colon Spacing
• comma: Comma Spacing
• comment_spacing: Comment Spacing
• compiler_protocol_init: Compiler Protocol Init
• computed_accessors_order: Computed Accessors Order
• control_statement: Control Statement
• cyclomatic_complexity: Cyclomatic Complexity
• deployment_target: Deployment Target
• discouraged_direct_init: Discouraged Direct Initialization
• duplicate_conditions: Duplicate Conditions
• duplicate_enum_cases: Duplicate Enum Cases
• duplicate_imports: Duplicate Imports
• duplicated_key_in_dictionary_literal: Duplicated Key in Dictionary Literal
• dynamic_inline: Dynamic Inline
• empty_enum_arguments: Empty Enum Arguments
• empty_parameters: Empty Parameters
• empty_parentheses_with_trailing_closure: Empty Parentheses with Trailing Closure
• for_where: Prefer For-Where
• force_cast: Force Cast
• force_try: Force Try
• function_body_length: Function Body Length
• function_parameter_count: Function Parameter Count
• generic_type_name: Generic Type Name
• identifier_name: Identifier Name
• implicit_getter: Implicit Getter
• inclusive_language: Inclusive Language
• invalid_swiftlint_command: Invalid SwiftLint Command
• is_disjoint: Is Disjoint
• large_tuple: Large Tuple
• leading_whitespace: Leading Whitespace
• legacy_cggeometry_functions: Legacy CGGeometry Functions
• legacy_constant: Legacy Constant
• legacy_constructor: Legacy Constructor
• legacy_hashing: Legacy Hashing
• legacy_nsgeometry_functions: Legacy NSGeometry Functions
• legacy_random: Legacy Random
• mark: Mark
• multiple_closures_with_trailing_closure: Multiple Closures with Trailing Closure
• nesting: Nesting
• no_fallthrough_only: No Fallthrough only
• no_space_in_method_call: No Space in Method Call
• non_optional_string_data_conversion: Non-optional String -> Data Conversion
• notification_center_detachment: Notification Center Detachment
• ns_number_init_as_function_reference: NSNumber Init as Function Reference
• nsobject_prefer_isequal: NSObject Prefer isEqual
• opening_brace: Opening Brace Spacing
• operator_whitespace: Operator Function Whitespace
• optional_data_string_conversion: Optional Data -> String Conversion
• orphaned_doc_comment: Orphaned Doc Comment
• prefer_type_checking: Prefer Type Checking
• private_over_fileprivate: Private over Fileprivate
• private_unit_test: Private Unit Test
• protocol_property_accessors_order: Protocol Property Accessors Order
• reduce_boolean: Reduce Boolean
• redundant_discardable_let: Redundant Discardable Let
• redundant_objc_attribute: Redundant @objc Attribute
• redundant_optional_initialization: Redundant Optional Initialization
• redundant_set_access_control: Redundant Access Control for Setter
• redundant_string_enum_value: Redundant String Enum Value
• redundant_void_return: Redundant Void Return
• return_arrow_whitespace: Returning Whitespace
• self_in_property_initialization: Self in Property Initialization
• shorthand_operator: Shorthand Operator
• static_over_final_class: Static Over Final Class
• superfluous_disable_command: Superfluous Disable Command
• switch_case_alignment: Switch and Case Statement Alignment
• syntactic_sugar: Syntactic Sugar
• todo: Todo
• trailing_comma: Trailing Comma
• trailing_newline: Trailing Newline
• trailing_semicolon: Trailing Semicolon
• type_body_length: Type Body Length
• type_name: Type Name
• unavailable_condition: Unavailable Condition
• unneeded_break_in_switch: Unneeded Break in Switch
• unneeded_override: Unneeded Overridden Functions
• unneeded_synthesized_initializer: Unneeded Synthesized Initializer
• unused_closure_parameter: Unused Closure Parameter
• unused_control_flow_label: Unused Control Flow Label
• unused_enumerated: Unused Enumerated
• unused_optional_binding: Unused Optional Binding
• unused_setter_value: Unused Setter Value
• valid_ibinspectable: Valid IBInspectable
• vertical_parameter_alignment: Vertical Parameter Alignment
• void_function_in_ternary: Void Function in Ternary
• void_return: Void Return
• xctfail_message: XCTFail Message

Opt-in Rules (123)

• anonymous_argument_in_multiline_closure: Anonymous Argument in Multiline Closure
• array_init: Array Init
• attributes: Attributes
• balanced_xctest_lifecycle: Balanced XCTest Life Cycle
• closure_body_length: Closure Body Length
• closure_spacing: Closure Spacing
• collection_alignment: Collection Element Alignment
• comma_inheritance: Comma Inheritance Rule
• conditional_returns_on_newline: Conditional Returns on Newline
• contains_over_filter_count: Contains over Filter Count
• contains_over_filter_is_empty: Contains over Filter is Empty
• contains_over_first_not_nil: Contains over First not Nil
• contains_over_range_nil_comparison: Contains over Range Comparison to Nil
• contrasted_opening_brace: Contrasted Opening Brace
• convenience_type: Convenience Type
• direct_return: Direct Return
• discarded_notification_center_observer: Discarded Notification Center Observer
• discouraged_assert: Discouraged Assert
• discouraged_none_name: Discouraged None Name
• discouraged_object_literal: Discouraged Object Literal
• discouraged_optional_boolean: Discouraged Optional Boolean
• discouraged_optional_collection: Discouraged Optional Collection
• empty_collection_literal: Empty Collection Literal
• empty_count: Empty Count
• empty_string: Empty String
• empty_xctest_method: Empty XCTest Method
• enum_case_associated_values_count: Enum Case Associated Values Count
• explicit_acl: Explicit ACL
• explicit_enum_raw_value: Explicit Enum Raw Value
• explicit_init: Explicit Init
• explicit_top_level_acl: Explicit Top Level ACL
• explicit_type_interface: Explicit Type Interface
• extension_access_modifier: Extension Access Modifier
• fallthrough: Fallthrough
• fatal_error_message: Fatal Error Message
• file_name: File Name
• file_name_no_space: File Name no Space
• final_test_case: Final Test Case
• first_where: First Where
• flatmap_over_map_reduce: Flat Map over Map Reduce
• force_unwrapping: Force Unwrapping
• function_default_parameter_at_end: Function Default Parameter at End
• ibinspectable_in_extension: IBInspectable in Extension
• identical_operands: Identical Operands
• implicit_return: Implicit Return
• implicitly_unwrapped_optional: Implicitly Unwrapped Optional
• inert_defer: Inert Defer
• joined_default_parameter: Joined Default Parameter
• last_where: Last Where
• legacy_multiple: Legacy Multiple
• legacy_objc_type: Legacy Objective-C Reference Type
• let_var_whitespace: Variable Declaration Whitespace
• local_doc_comment: Local Doc Comment
• lower_acl_than_parent: Lower ACL than Parent
• missing_docs: Missing Docs
• multiline_arguments: Multiline Arguments
• multiline_arguments_brackets: Multiline Arguments Brackets
• multiline_literal_brackets: Multiline Literal Brackets
• multiline_parameters: Multiline Parameters
• nimble_operator: Nimble Operator
• no_empty_block: No Empty Block
• no_extension_access_modifier: No Extension Access Modifier
• no_grouping_extension: No Grouping Extension
• no_magic_numbers: No Magic Numbers
• non_overridable_class_declaration: Class Declaration in Final Class
• nslocalizedstring_key: NSLocalizedString Key
• nslocalizedstring_require_bundle: NSLocalizedString Require Bundle
• number_separator: Number Separator
• object_literal: Object Literal
• one_declaration_per_file: One Declaration per File
• operator_usage_whitespace: Operator Usage Whitespace
• optional_enum_case_matching: Optional Enum Case Match
• overridden_super_call: Overridden Method Calls Super
• override_in_extension: Override in Extension
• pattern_matching_keywords: Pattern Matching Keywords
• period_spacing: Period Spacing
• prefer_key_path: Prefer Key Path
• prefer_nimble: Prefer Nimble
• prefer_self_in_static_references: Prefer Self in Static References
• prefer_self_type_over_type_of_self: Prefer Self Type Over Type of Self
• prefer_zero_over_explicit_init: Prefer Zero Over Explicit Init
• prefixed_toplevel_constant: Prefixed Top-Level Constant
• private_action: Private Actions
• private_outlet: Private Outlets
• private_subject: Private Combine Subject
• private_swiftui_state: Private SwiftUI State Properties
• prohibited_interface_builder: Prohibited Interface Builder
• prohibited_super_call: Prohibited Calls to Super
• quick_discouraged_focused_test: Quick Discouraged Focused Test
• quick_discouraged_pending_test: Quick Discouraged Pending Test
• raw_value_for_camel_cased_codable_enum: Raw Value for Camel Cased Codable Enum
• reduce_into: Reduce into
• redundant_nil_coalescing: Redundant Nil Coalescing
• redundant_self_in_closure: Redundant Self in Closure
• redundant_type_annotation: Redundant Type Annotation
• required_deinit: Required Deinit
• required_enum_case: Required Enum Case
• return_value_from_void_function: Return Value from Void Function
• self_binding: Self Binding
• shorthand_argument: Shorthand Argument
• shorthand_optional_binding: Shorthand Optional Binding
• single_test_class: Single Test Class
• sorted_enum_cases: Sorted Enum Cases
• sorted_first_last: Min or Max over Sorted First or Last
• static_operator: Static Operator
• strict_fileprivate: Strict Fileprivate
• strong_iboutlet: Strong IBOutlet
• superfluous_else: Superfluous Else
• switch_case_on_newline: Cases on Newline
• test_case_accessibility: Test Case Accessibility
• toggle_bool: Toggle Bool
• trailing_closure: Trailing Closure
• unavailable_function: Unavailable Function
• unhandled_throwing_task: Unhandled Throwing Task
• unneeded_parentheses_in_closure_argument: Unneeded Parentheses in Closure Argument
• unowned_variable_capture: Unowned Variable Capture
• untyped_error_in_catch: Untyped Error in Catch
• unused_capture_list: Unused Capture List
• unused_parameter: Unused Parameter
• vertical_parameter_alignment_on_call: Vertical Parameter Alignment on Call
• weak_delegate: Weak Delegate
• xct_specific_matcher: XCTest Specific Matcher
• yoda_condition: Yoda Condition